Helicopter-borne Electromagnetics (HEM) Germany - Models (WMS)
Description
This dataset has been compiled from diverse BGR airborne surveys in Germany. The survey areas supplement the dataset consisting of the areas along the German North Sea coast. The BGR helicopter (Sikorsky S-76B) is used for airborne geophysical surveying of the Earth’s subsurface. The standard equipment comprises the methods electromagnetics, magnetics and radiometrics. The active multi-frequency, helicopter-borne electromagnetic (HEM) system, which consists of circular (diameter about 0.5 m) transmitter and receiver coils (horizontal separation about 8 m) operating at five and since 2007 at six system frequencies, is housed by a flying tube (bird) about 40 m beneath the helicopter. The HEM system used before 2002 consisted of rectangular coils (horizontal separation slightly less than 7 m) and five system frequencies (0.4 - 190 kHz). The ratio of received and transmitted signal yields to the electrical conductivity down to 50/150 m depth in case of conductive/resistive subsurface. Horizontal resistivity (= inverse of conductivity) sections are derived at several depths from multi-layer inversion results (1D resistivity-depth models).
Resources
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https://services.bgr.de/wms/aerogeophysik/festland_hem_modelle/? |
Tags
- airborne-geophysics
- apparent-resistivity
- hubschrauber-elektromagnetik
- halbraumwiderstand
- centroid-depth
- aerogeophysik
- schwerpunktstiefe
- infomapaccessservice
- geology
- helicopter-borne-electromagnetics
- elektrische-leitfähigkeit
- resistivity
- spezifischer-widerstand
- electrical-conductivity
- deutschland